Fanuc alarm SP9081: MOTOR SENSOR 1-ROT SIGNAL DETECTION ERROR
spindle alarm (serial spindle, alpha i) · Fanuc 0i-D
What it means
The one-revolution signal of the motor sensor was detected erroneously. The built-in motor coder's index pulse appeared malformed or out of context, undermining absolute angle tracking used for orientation and rigid tapping.
Likely causes
- Degraded index track in the built-in sensor
- Interference on the sensor serial link
- Sensor mounting/coupling loosening
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
- View part →
A860-2000-T301
alpha i built-in motor sensor (Mi coder) · Common cause
Need the part urgently?
Send us alarm SP9081 with your machine details — typical RFQ turnaround is 24–48h.